Description Meet Grimpy! He.s a dumbo octopus, and he.s taking us on a tour of the whole cephalopod class.underwater creatures such as cuttlefish, nautiluses, octopuses, and squids. . Grimpy knows all about what makes these many-armed marvels so special, like how the coconut octopus uses tools or the cuttlefish talks with color! It seems like every creature has a special ability.except him. When Grimpy gets stuck on everything a dumbo octopus can.t do, the other cephalopods show him why it.s great to be a dumbo.